Compensation Programs (Schedule Of Performance-Based Stock Award) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value Per Share	$ 12.80
Total Original Grants	0		0	30,000
Final Measurement Period Ends December 31	July 1, 2014
Remaining Shares Vesting in Period	77,164
2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Original Grants	225,000
2008 [Member] | Performance-Based Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Year of Grant	2008
Grant Date Fair Value Per Share	$ 10.18
Total Original Grants	140,658	[1]
Final Measurement Period Ends December 31	2015
Percentage of performance based awards granted, actual	50.00%
2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Original Grants	225,000
2009 [Member] | Performance-Based Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Year of Grant	2009
Grant Date Fair Value Per Share	$ 14.33
Total Original Grants	110,917
Final Measurement Period Ends December 31	2016
2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Original Grants	60,000
2010 [Member] | Performance-Based Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Year of Grant	2010
Grant Date Fair Value Per Share	$ 12.44
Total Original Grants	128,766
Final Measurement Period Ends December 31	2017
2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Original Grants	72,000
2011 [Member] | Performance-Based Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Year of Grant	2011
Grant Date Fair Value Per Share	$ 12.72
Total Original Grants	132,490
Final Measurement Period Ends December 31	2018
Remaining Shares With Initial Measurement Period 2012 [Member] | 2008 [Member] | Performance-Based Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period	67,595
Remaining Shares With Initial Measurement Period 2012 [Member] | 2009 [Member] | Performance-Based Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period	55,043
Remaining Shares With Initial Measurement Period 2013 [Member] | 2009 [Member] | Performance-Based Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period	55,035
Remaining Shares With Initial Measurement Period 2013 [Member] | 2010 [Member] | Performance-Based Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period	64,087
Remaining Shares With Initial Measurement Period 2014 [Member] | 2010 [Member] | Performance-Based Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period	64,077
Remaining Shares With Initial Measurement Period 2014 [Member] | 2011 [Member] | Performance-Based Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period	66,247
Remaining Shares With Initial Measurement Period 2015 [Member] | 2011 [Member] | Performance-Based Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period	66,243

[1] The performance criteria for the first three-year measurement period ending December 31, 2011 was met resulting in the vesting of the first 50% of this grant.